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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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There are 20 feet of blood vessels in each square inch of human skin.
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The average adult has about 21 square feet of skin.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.